Expansion-bolt



No. 623.809. PatentedlAp. 25, i899. K. & V. MGCREERY.

ExPANsmN BoLT.

(Application filed May 5, 189B.)

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WITNESSES. INVENTOR'.

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`dnire KING MOREERY AND VANOE MORERY, OF TOLEDO, OHIO.

EXPANSION-BOLT.

SPECIFICATION forming part of Letters Patent No. 623,809, dated April25, 1899. Application filed May-5, 1898. Serial No. 679,774.. (Nomodel.)

To @ZZ whom it may concern,.-

Be it known that we, KING MCOREERY and VANCE MCGREERY, citizens of theUnited States, residing at Toledo, county of Lucas, State of Ohio, haveinvented a certain new and useful Improvementin Expansion-Bolts; and wedeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, which form a part-ofthis specification.

Our invention has reference to an expansion-bolt of novel construction;and it consists of the devices described in the specification andillustrated in the accompanying drawings, in which- Figure lis a view inside elevation and vertical section, showing our improved device inplace. gitudinal section. Fig. 3 is a cross-section of Fig. 2 on theline 3 3. tion illustrating a modification of the invention. Fig. 5 is alongitudinal section illustrating a modification of the invention andFig. 6 is a view in cross-section on the line 6 6, Fig. 5.

The utility and desirability of an efficient expansion-bolt are wellunderstood. Our invention is designed to provide a device of thischaracter of superior simplicity and utility.

i/Ve carry out our invention as follows:

A indicates a ferrule constructed with two or more expansion-jaws a,said ferrule being kerfed or longitudinally slotted between the adjacentedges of said jaws, as indicated at d', said jaws, however, integrallyuniting at their forward ends with an interiorly-threaded collar d2,forming the forward end of said ferrule. B is a threaded device-as aboit, for example-having a threaded engagement within said collar. Theinner faces of the jaws a are normally made wedge-shaped and taperingfrom the collar toward the opposite ends of the jaws, as indicated ata3, the space therebetween normally narrowing toward the innerextremities of said-jaws, so that when the threaded device or bolt B isforced within the ferrule the inner end of said bolt, forced against theangular or wedge-shapedfaces of said jaws, will expand the inner ends ofsaid jaws. The ferrule may be made of any suit- Fig. 2 is a View of thedevice in lon-' Fig. 4 is a cross-secable material-f-as of malleableiron or brass, for examplepermitting said jaws to yield when the bolt isforced within the ferrule.

Expansion-bolts have been employed, for example, to attach variousdevices to brickwork. An example of the use of said bolts is shown inFig. l, where a fire-escape O is attached to a solid wall D. Difficultyhas been found with expansion-bolts heretofore constructed, where thebolt is made to expand at the forward or outer end or uniformlythroughout the whole length of the device engaged in the solid wall, forthe reason that where the bolt is expanded throughout or at the forwardor outer end it has been found Very liable to become disengaged and tobe pulled out of the wall. Our improved device is constructed andarranged, it will be seen, to expand only at the rear or inner end ofthe ferrule, said jaws being arranged to expand at their inner or rearends, while the forward end of the ferrule is not made expansible. Itwill be evident that-by forcing the threaded device B within the ferrulethe jaws are expanded or forced outward at their rear or inner ends,while the forward end of the ferrule remains unexpanded.

In Figs. 2, 3, 5, and 6 the ferrule is shown constructed withtwoexpansible jaws, while in Fig. 4 three expansible jaws are shown. Wewould have it understood that we contemplate constructing the ferrulewith any desired number of expansible jaws. In Fig. 5 a modification isshown in which an expansion wedge or block E is employed, located Withinthe expansible jaws and arranged to be forced rearward when the threadeddevice B is forced within the ferrule. In this case the inner surfaceof.the jaws may be concaved, as indicated in Fig. 6 at a3, to assist inholding the block E in place. Our invention contemplates the employmentof any suitable deviee in connection with the ferrule to expand the rearor inner ends of said jaws, while the outer or forward extremity of theferrule remains unexpanded.

The threaded device or bolt B may be squared or otherwise constructed,as indicated at b, for the engagement of a wrench therewith to force thebolt within the expansible jaws, and may also be provided with a nut(indicated at 12') to hold the device in place.

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The collar d2 being ina single integral piece and integral with the jawsobviously cannot expand when the boltis forced into it.

Figs. 2 and 5 of the drawings show the outer surfaces of the jawscorrugated; but we do not limit ourselves to any specific form of theouter surfaces thereof. The corrugations are employed to facilitate thedevice being held in place.

The drawings show the normal outer diameter of the jaws at theirextremities opposite the collar not to exceed the diameter of thecollar, and in Fig. 2 is shown a construction wherein thenormal outerdiameter of the jaws at their extremities opposite the collar isnarrower than the collar, the outer surfaces of the jaws normallytapering from the collar toward the opposite ends thereof. The outersurfaces of the jaws are also shown corrugated on their exterior, thecorrugated surfaces of said jaws being constructed and arranged tocontact with an adjacent wall of a receivingorifice when the jaws areexpanded substantially the whole length of the jaws, so that an equalpressure will be exerted by the jaws against the walls of thereceiving-orifice the whole length of saidjaws, Having the outersurfaces of the jaws constructed to conta-ct with the wall of an outsidestructure in which the jaws are engaged substantially the whole lengthof the jaws is -an important feat-ure, inasmuch as such a constructionserves to prevent lateral vibration and to communicate the strain of thejaws upon said walls the whole length ofsaid jaws. Moreover, by makingthe normal diameter of the jaws at their ends opposite the collar not toexceed the diameter of the collar we avoid any necessity of enlargingthe inner end of the orifice in the structure to which our improved boltis applied. lygettingastrain of the arms against lhe walls the fulllength of the arms the outer material is prevented from chipping off,and the expansion device is also prevented from working loose in case oflateral strain of any kind. Thus our device can be used, for example, inengine foundations for the purpose of securing the engine so as toprevent vibration.

\Vhat we claim as our invention is l, An expansion-bolt having incombination a ferrule provided with expansible jaws integrally united atone end and made wedgeshaped on their inner'faces, the inner faces ofsaid jaws tapering from the integrally-united ceases ends thereof towardthe opposite ends of the jaws, and means for expanding said jaws, thenormal outer diameter of said jaws at their extremities opposite thecollar not exceeding the diameter of said collar, substantially as setforth.

2. An expansion-bolt having in combination a ferrule provided with aninternallythreaded collar at one end, expansible jaws integrally unitedto said collar and made wedgeshaped on their inner faces, and a threadeddevice engaged with said collar to project bctween said jaws to expandthe jaws, the inner surfaces of said jaws tapering from the collartoward the opposite ends thereof, and the outer surfaces of said jawsnormally tapering from the collar toward the opposite lends thereof,substant-ially as set forth.

3. An expansion-bolt having in combina tion a ferrule provided with aninternallythreaded collar at one end, expansible jaws integrally unitedto said collar and made wedge-shaped on their inner faces, and athreaded device engaged with said collar to project between'said jaws toexpand the jaws, the outer surfaces of said jaws corrugated on theirexterior, the corrugated surfaces of the jaws arranged to contact withthe adjacent walls of a receiving-orifice, when expanded, substantiallythe whole length of the jaws, whereby an equal pressure will be exertedby the jaws the whole length thereof upon an outside structure withwhich the jaws are engaged, substantially as set forth. l

a. An expansible bolt having in combination a ferrule provided withexpansible jaws, an internally-tln'eaded collar integrally uniting saidjaws at one end thereof, a threaded device engaged with said collar, anda wedge or block between said jaws to be forced away from the collar bysaid threaded device to expand said jaws, said jaws made wedge-shaped ontheir inner faces, the inner faces of the jaws tapering from the collartoward the opposite ends thereof, the normal outer dialneter of saidjaws at their extremities opposite the collar not exceeding the diameterof said collar, substantially as set forth.

In testimony whereof we sign this specification in the presence of twowitnesses.

KING MCCREERY. V ANCE MCCREERY. lVitnesses:

GEO. JENNINGS, LYMAN W. WACHENHEIMER.

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